The official name of Earth 75 million years ago, when the sinister Lord Xenu brought trillions of his people to Teegeeack and blew them to bits, leaving their spirits to haunt the planet for all time to come. Or at least that's the story from the cult of Scientology. You can pay Scientology thousands of dollars and they will drive the spirits of Xenu's victims (called "Thetans") from your body and you will reach a higher state of being. Or at least that's what they say.
Xenu put his excess population into volcanoes on Teegeeack and then blew them up with nuclear weapons.